Yes ,The Spirit Airlines carry-on baggage allowance is one small personal item; 18 x 14 x 8 inches (45 x 35 x 20 cm). A fee applies to bring an additional, larger item, with dimensions of 22 x 18 x 10 inches (56 x 46 x 25 cm). Backpack should be fine if not to big,
Yes. Even a small suitcase can be.
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